Definition of likeliest:
(adj) :
Probable; having a greater-than-even chance of occurring.
(adj) :
(as predicate, followed by to and infinitive) Reasonably to be expected; apparently destined, probable.
(adj) :
Leading with high probability to some specified outcome.
(adj) :
Plausible; within the realm of credibility.
(adj) :
Appropriate, suitable; believable; promising, having a good potential.
(adv) :
Probably.